I have tried the Designer Protein but I get very ill after taking it

Help! I am 7 mths post-op and haven't really concentrated on getting my protein in. I am now determined to do this. I purchased Designer Protein. I have used it with orange juice (unsweetened) or 2% milk or water mixing that with 1/2 banana and 2 frozen stawberries. The first week was good. Now into the second week, I get a slight headache with a stomach ache(almost like I ate sugar).I really get sick for about 30 minutes after drinking this. What am I doing wrong?

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